linux-kernel - Re: [PATCH v3] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support

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Message-ID: <ad0a961c523aa50f25380b339e1cb6f50109a5fe.camel@redhat.com>
Date:   Tue, 19 Sep 2023 15:13:35 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Roger Quadros <rogerq@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, vladimir.oltean@....com
Cc:     horms@...nel.org, s-vadapalli@...com, srk@...com, vigneshr@...com,
        p-varis@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: ethernet: ti: am65-cpsw-qos: Add Frame
 Preemption MAC Merge support

On Mon, 2023-09-18 at 12:53 +0300, Roger Quadros wrote:
> Add driver support for viewing / changing the MAC Merge sublayer
> parameters and seeing the verification state machine's current state
> via ethtool.
> 
> As hardware does not support interrupt notification for verification
> events we resort to polling on link up. On link up we try a couple of
> times for verification success and if unsuccessful then give up.
> 
> The Frame Preemption feature is described in the Technical Reference
> Manual [1] in section:
> 	12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
> 
> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
> 
> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c    |   2 +
>  drivers/net/ethernet/ti/am65-cpsw-nuss.h    |   5 +
>  drivers/net/ethernet/ti/am65-cpsw-qos.c     | 240 ++++++++++++++++----
>  drivers/net/ethernet/ti/am65-cpsw-qos.h     | 104 +++++++++
>  5 files changed, 454 insertions(+), 47 deletions(-)
> 
> Changelog:
> 
> v3:
> - Rebase on top of v6.6-rc1 and mqprio support [1]

I'm unsure if this will require a rebase for the next revision of the
mqprio support. Anyhow the two patches are related, it's probably
better bundle them in a series so that the dep is straight-forward.

When reposting, please insert the target tree in the subject profix
(net-next in this case).

Thanks!

Paolo